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X Forwarded For Chain Normalizer
x402
X Forwarded For Chain Normalizer is a paid API for AI agents from api.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-19).
Normalizes and validates an X-Forwarded-For proxy chain header, returning the parsed chain, computed findings, and a pass/advisory status as deterministic JSON.
Price / call$0.001
Success—
StatusUnknown
How this service works
X Forwarded For Chain: X Forwarded For Chain normalizes a proxy chain without deciding whether an address is trusted from bounded caller-supplied values without an external provider. Call X Forwarded For Chain before accepting, caching, redirecting, or retrying a caller-supplied web response. Returns normalized web evidence, the computed finding, and an explicit pass or advisory status for X Forwarded For Chain as versioned deterministic JSON. Price: $0.001 USDC via x402 on Base. First-party, s…
Output
Returns a versioned deterministic JSON object containing the normalized X-Forwarded-For proxy chain, a computed finding describing the chain's structure or issues, and an explicit pass or advisory status indicating whether the header is acceptable.
Example use cases
Validate proxy chain before rate limiting
“Before I apply rate limiting to this request, check the X-Forwarded-For header '203.0.113.195, 10.0.0.1' — normalize it and tell me if it passes or if there's anything advisory I should know.”
Sanitize header before caching response
“I'm about to cache a response based on the caller's IP — can you normalize and validate this X-Forwarded-For chain '198.51.100.42, 172.16.0.5' so I know it's clean before I use it as a cache key?”
Audit forwarded header in security review
“During our security audit, I need to check this X-Forwarded-For value from our logs: '10.1.1.1, 203.0.113.99, unknown' — normalize it, parse the chain, and flag anything suspicious or non-passing.”
Technical details
Endpoint
POSThttps://api.delx.ai/api/v1/x402/x-forwarded-for-chain?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a deterministic, versioned, stateless normalization and validation of X-Forwarded-For headers before security-sensitive operations such as accepting, caching, redirecting, or rate-limiting caller-supplied web requests. Prefer it over ad-hoc regex parsing when you need a consistent, auditable pass/advisory finding with no external dependencies or data retention.
Side effects
- Header string exceeds 8192 character limit — request rejected
- Malformed or unparseable header values — advisory status returned with findings
- Missing header field — endpoint may return error or empty chain result
- Network timeout or transient API error — retry with same input for deterministic result
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| header | string | Header supplied to X Forwarded For Chain; used only for this bounded calculation and processed in memory without retention. |
Output
Schema · Response
{
"type": "json",
"example": {
"result": {
"addresses": [
"203.0.113.1",
"198.51.100.7"
],
"hop_count": 2,
"trust_decision": "not_evaluated"
},
"schema": "delx/util-x-forwarded-for-chain/v1",
"status": "pass",
"evidence": {
"retained": false,
"input_sha256": "f8588bb5312c2456e1267b1eeb6b19b2c35299b60cb7bcdc7fa6aef7bc97373d",
"external_calls": 0
},
"operation": "web_reliability:x_forwarded_for_chain"
}
}Tags
x402
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